7.57PM: Lake Awoonga peaked at 42.1m around midday today, according to the Gladstone Area Water Board.
Awoonga Dam now sits at 42.02m - 118% capacity and 2.02m above the spillway.
The Water Board said water levels were falling and could be expected to recede to 41.5m - the level at which Gladstone Monto Rd becomes inundated - around midnight tomorrow or early Saturday, dependent on any further rainfall in the catchment.
Click here for more information on the region's predicted weather over the weekend.
9am: AWOONGA Dam is two metres over the spillway and is still expected to rise.
As at 10am this morning the level at Lake Awoonga was 42.09m, which is 2.09m over the 40m spillway.
And even though rainfall has eased off in the catchment area, modelling based on Bureau of Meteorology data shows the lake's water levels are expected to rise by another 0.81m (reaching 42.9m total) by tonight.
"There's a steady inflow as it moves down the Boyne Valley and into the lake," a GAWB spokeswoman said.
She added that Pikes Crossing and the Gladstone Monto Road are impassable.
"Boyne Valley becomes isolated when the [dam] level reaches 41.5m, and we're now almost a good metre above that."
She said once it peaks, the dam's level will slowly drop back down.
"But it can take some time. 3m over the spillway is a lot," the spokeswoman said.
Boynedale Bush Camp and the Lake Awoonga Recreational Areas are closed, but lookout one, near the Recreational Area, is open.
GAWB will have another update later today.